Well... this was a topic here when it was new news in April of 2018.
DAK's number rose more than the other 3 WDW parks precisely because of Pandora, RoL, and becoming an "all day park."
Then our insiders related that this freaked some Disney execs when they realized that when SWL opens in DHS, Epcot would become their #4 park in Orlando. Epcot is huge and has some cachet as a premier theme park. So, to think of it dropping to #4, behind DHS, even, it was to shudder.
Thus, the timetable for Rat was moved up a year. Also moved up was a new fireworks show, but since the new permanent one wouldn't be ready in time, they're doing in interim show.
They also expanded the entertainment schedule at the festivals of Art and Flower. And they're rushing to get two new restaurant added this calendar year.
All this to boost Epcot's numbers: more rock acts, longer festivals, new fireworks show, new restaurants. That should get it to surpass DAK and still be #3 in 2019 when SWL opens.
Then the following year, there will be Rat opening, and the year after that, GotG (and maybe the Poppins ride), and the year after that, maybe Brazil.
It will be back at #2 when it's all said and done, watch. And all the naysayers on this thread will still be complaining. Can't please everyone.